单选题
To the other Europeans, the best known quality of the British, and in particular of the English, is "reserve". A reserved person is one who does not talk very much to strangers, does not show much emotion(feeling) and seldom gets excited. It is difficult to get to know a reserved person: he never tells you anything about himself, and you may work with him for years without knowing where he lives, how many children he has, and what his interests are. English people tend to be like that. If they are making a journey by bus, they will do their best to find an empty seat; if by train, an empty compartment(车厢). If they have to share the compartment with a stranger, they may travel many miles without starting a conversation. If a conversation does start, personal questions like "How old are you?" or even "What is your name? "are not easily asked, and it is quite possible for two people to know each other casually(偶尔地) for years without ever knowing each other"s name. Questions like "Where did you buy your watch?" or "What is your salary (how much you make)? " are almost impossible. Similarly, conversation in Britain is in general much more quiet and restrained(拘束的)than, say, in Africa,, and loud speech is considered ill--bred (教养不好的).
单选题
In what way may we know that a person is "reserve"?